a-(1/a)=√3 হলে a2-(1/a2) এর মান কত?

A √21

B 4

C 1

D √3

Solution

Correct Answer: Option A

দেওয়া আছে,
a-(1/a)=√3

আমরা জানি,
(a + 1/a)2= (a-1/a)2+4.a.1/a
⇒ (a + 1/a) = √{(a-1/a)2+4.a.1/a}
⇒ (a + 1/a) = √{(√3)2 + 4}
(a + 1/a) = √ (3 + 4) = √7


a2-(1/a2)  = (a + 1/a) (a - 1/a)
a2-(1/a2)  = √7 ×  √3 = √21

Practice More Questions on Our App!

Download our app for free and access thousands of MCQ questions with detailed solutions